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https://github.com/DCC-EX/CommandStation-EX.git
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43319fd3dd
Add new read/write functions to I2CManager class, and modify the LCD, OLED and PWM classes to use them effectively.
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
/*
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* © 2021, Neil McKechnie. All rights reserved.
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*
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* This file is part of CommandStation-EX
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef I2CManager_h
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#define I2CManager_h
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#include "FSH.h"
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/*
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* Helper class to manage access to the I2C 'Wire' subsystem.
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*
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* Helps to avoid calling Wire.begin() multiple times (which is not)
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* entirely benign as it reinitialises).
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*
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* Also helps to avoid the Wire clock from being set, by another device
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* driver, to a speed which is higher than a device supports.
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*
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* Thirdly, it provides a convenient way to check whether there is a
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* device on a particular I2C address.
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*/
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class I2CManagerClass {
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public:
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I2CManagerClass() {}
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// If not already initialised, initialise I2C (wire).
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void begin(void);
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// Set clock speed to the lowest requested one.
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void setClock(uint32_t speed);
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// Force clock speed
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void forceClock(uint32_t speed);
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// Check if specified I2C address is responding.
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uint8_t checkAddress(uint8_t address);
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bool exists(uint8_t address);
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// Write a complete transmission to I2C from an array in RAM
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uint8_t write(uint8_t address, const uint8_t buffer[], uint8_t size);
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// Write a complete transmission to I2C from an array in Flash
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uint8_t write_P(uint8_t address, const uint8_t buffer[], uint8_t size);
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// Write a transmission to I2C from a list of bytes.
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uint8_t write(uint8_t address, int nBytes, ...);
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// Write a command from an array in RAM and read response
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uint8_t read(uint8_t address, uint8_t writeBuffer[], uint8_t writeSize,
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uint8_t readBuffer[], uint8_t readSize);
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// Write a command from an arbitrary list of bytes and read response
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uint8_t read(uint8_t address, uint8_t readBuffer[], uint8_t readSize,
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uint8_t writeSize, ...);
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// Write a null command and read the response.
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uint8_t read(uint8_t address, uint8_t readBuffer[], uint8_t readSize);
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private:
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bool _beginCompleted = false;
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bool _clockSpeedFixed = false;
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uint32_t _clockSpeed = 400000L; // 400kHz max on Arduino.
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};
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extern I2CManagerClass I2CManager;
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#endif |